I believe they have 20 of the tiny cleanrooms, each will produce roughly 50 batches a year. That's 1000 batches a year. I believe they'll need more than that for the UK alone, but it's a start. Sawston has large cleanroom being built for the EDEN Unit, I don't believe it will be that long before they'll be up and running. It might come with the approval in the UK alone, but once that's done the others will follow in the not that distant future.
As always, this is JMHO, the 20 cleanrooms came from reading someone else's posts, and my memory that the suites were being built with 10 cleanroom per suite. If I'm wrong about that, please correct me.
When I speak about Sawston not supporting very much in manual production, these are the numbers that I believed applied, even if I'm off by a figure of two it's not all that many patients getting treatment.
Gary